Peace and security being established in his dominions, he convoked an assembly of the states and declared his son Malik Shah his heir and successor.
Malak-bel has been explained as " messenger of Bel "; but more probably Malak is the common Babylonian epithet malik given to various gods, and means " counsellor "; Malak-bel will then be the sun as the visible representative of Bel.
Till the year 1079 the Persian year resembled that of the ancient Egyptians, consisting of 365 days without intercalation; but at that time the Persian calendar was reformed by Jelal ud-Din Malik Shah, sultan of Khorasan, and a method of intercalation adopted which, though less convenient, is considerably more accurate than the Julian.
Malik Shah, third of the Seljuk dynasty of Persia, passed the Oxus about the end of the 11th century, and subdued the whole country watered by that river and the Jaxartes.
The Discovery Of The Period Of Thirty Three Years Is Ascribed To Omar Khayyam, One Of The Eight Astronomers Appointed Byjelal Ud Din Malik Shah, Sultan Of Khorasan, To Reform Or Construct A Calendar, About The Year 1079 Of Our Era.